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Self-Tuning Mechanism for the Design of Adaptive Secondary Mirror Position Control

Journal
Date Issued
2015
Author(s)
Battistelli, Giorgio
•
Mari, Daniele
•
•
Tesi, Pietro
DOI
Abstract
Deformable mirrors (DMs) are electromechanical devices used in ground-based telescopes to compensate for the distortions caused by the atmospheric turbulence, the main factor limiting the resolution of astronomical imaging. Adaptive secondary mirrors (ASMs) represent a new type of DMs; two of them have been recently installed on the 8-m-class large binocular telescope (LBT). ASMs are able to jointly correct rigid and nonrigid wave-front distortions thanks to the use of force actuators distributed on the overall mirror surface. As an offset, each actuator needs to be piloted by a dedicated controller, whose parameters must be accurately tuned to obtain the desired mirror shape. At the present time, the calibration of the controller parameters is executed manually. This paper presents a novel automatic controller tuning procedure that does not rely on the modeling of the mirror dynamics. The experimental validation on a prototype reproducing the three innermost rings of the LBT ASM is reported.
Volume
23
Issue
6
Start page
2087
Uri
Url
Issn Identifier
1063-6536
Rights
open.access
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